The developer of Sigma Theory sent word recently that they now have a Linux demo up for their futuristic global cold war espionage game.

Firstly, you will probably need to run it in windowed mode. If you don't see the Unity launcher, you can run the game in terminal with this added to the end to get it into windowed mode:

-screen-fullscreen 0

It seems to be built with a version of Unity that has the unfortunate bug of getting no input when in fullscreen. It's an older bug, one that affected many games in the past which should have been long since fixed. At least I haven't seen it in any recent Linux game using the Unity game engine. Apart from that, it works fine in windowed mode.

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